Why do the spaces I include between paragraphs in edit mode get deleted once I save changes?

[thompsonjs]

In the last few months (this was not the case before), whenever I create an Announcement or Discussion or Page, my formatting keeps getting changed when I save my edits. Particularly, any spaces I insert between paragraphs keeps getting ignored and the paragraphs are smashed together, creating very ugly and confusing formatting. Why is this happening?